CUSTOMER CONCERN Vehicle will not operate or charge and stores DTC P0AA6. CAUSE High-voltage isolation testing measured 90 volts between the positive battery terminal and battery case. Isolating the module stacks identified battery module 37 shorted from its positive side to its casing. CORRECTION Remove and replace failed high-voltage battery module 37, reassemble the battery pack, clear DTC P0AA6, and verify vehicle operation and charging.